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It could be a Ford 6.6 or 7.8, a Cat 3208, or a Detroit 8.2.
Swapping them? You mean one to the other, or putting in a diesel where there was once a gasser?
It all depends on what you do yourself, and what deals you can find. There happens to be a 6.6 with an Allison auto on ebay for $1500. You could do it for much less than 8 grand. If you're paying a shop to do it, then it would be about 8.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.